Have you tried doing a search here?  I think this topic has been covered before but I don't remember in how much depth.

We have had two short trips in Algonquin PP and enjoyed them.  But they were SOOOO long ago!  Took our daughter there for her first trip in 1978 (put in at the Tim River).  Saw several moose, but don't remember a lot of other details.  As I remember the portages weren't too bad.  Then we spent a few days on Opeongo Lake in 1989.  We did enjoy our time paddling in APP, but since we don't fish, we can't be very helpful in your query.

Enjoy the journey.